Air cleaner



Oct. 28. 1924- F. A. DONALDSON AIR CLEANER Filed Aug. 31. 1923' ZSheets-Sheet l im! um I [Hm U 00 54/? /4 D W/ .5 I ilk 41 W Oct. 28. 1924. 1,513,036

F. A. DONAVLDSON 7 AIR CLEANER Filed Aug. 31, 1923 2 Shuts-Shut 2 hm fin/7A ,4, Don/9G0 M 5% z ik Patented Oct. 28, 1924.

UNITED STATES FRANK A. DONALIDSON, OF MINNEAPOLIS, MINNESOTA.

AIR CLEANER.

Application filed August 31, 1923. Serial No. 660,412.

To all whom it may concern:

Be it known that I, FRANK A. DONALDSON, a citizen of the United States, residing at Minneapolis, in the county ofHennepin and a State of Minnesota, have invented certain new and useful Improvements in Air Cleaners; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

'My present invention relates to air cleaners for use in connection with carburetors of internal combustion engines and, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims. Certain of the features herein disclosed are also disclosed and more broadly claimed in my pending application, Serial No. 514,628, filed of date November 12, 1921, and in the division of said application, filed of date Aug. 31, 1923, under Serial No. 660,411.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings: Fig. 1 is a side elevation showing one of my improved air cleaners applled to an internal combustion engine and connected to the air intake of the carburetor of said en- 1118' g Fig. 2 is'a horizontal section taken on the line22 of Fig. 1;

Fig. 3 is a vertical section taken on the line 3-3 of Fig.2; Fig. 4 isa vertical axial section illustrating a modified form of the air cleaner; and Fig. 5 is a horizontal sectiontaken on the line 5-5 of Fig. 4.

- The construction illustrated 1n F gs. 1, 2 and 3 will first be described; The engine diagrammatically illustrated in Fig. 1 is or may be assumed to be of the Ford type, the said engine being indicated as an entirety by the numeral 6 and its intake and exhaust manifolds, respectivelv. bv the numerals 7 and 8. The carburetor, which. is of the usual or any suitable construction and is connected in the customary way to the intake manifold '7, is indicated by the numeral 9.

The air cle n r here illustrated comprises telescopic engagement.

shown, is dished inward and provided with a horizontally disposed cylindrical outer shell 10 that is provided with heads 11 and,

12 applied to the ends thereof with slight The head" 11,, as

an outstanding axial sleeve 13 that affords R an air discharge port from the air cleaner and is connected to the air intakepassage of 16 is an annular collar. 18, preferably, of

sheet metal, formed with an outwardly; and backwardlyextended flange "19 that affords a seat to receive one end of a cylindrical wire screen 20, the otherend of which-screen is pressed against the head- 12. Soldered or otherwiserigidly secured within the collar 18 is a -collar18? that is formed with pressed threads adapting it'to be screwed onto the neck 15.

The aircleaner above described may be operated in any suitable position, but for application to engines of the Ford type, it is advisably horizontallydisposed and secured closely adjacent to or against the exhaust manifold 8 by a saddle bracket 22, which latter, as shown, is anchored to said manifold by nut-equipped studsf23; The outer shell 10 is providedwith air intake ports 2 1 advisably located on the under side thereof quite close to the exhaust manifold 8, so that the air drawn into the shell, to be cleaned and,

thereafter to be delivered to the carburetor, will be more or lesspreheaied' by heat radiated from said exhaust manifold- In the. operation of the engine, suction produced throu h the carburetor in the customaryway "wi produce a partial vacuum in the perforated inner tube 16, so that air will be drawn in through the air intake ports 24;, distributed around, the screen 20and file over, this clean air will be preheated. to a considerable extent by heat radiated from the exhaust manifold, as above noted, and further by heat conducted to the interior of the shell 10. When the filtering material has become too much loaded with collected dust, it may be readilyremoved, quickly cleaned in gasoline and replaced in working position. To perform the actions just noted, the head 12 will be rotated, thereby rotating therewith the perforated tube 16 and the threaded collar 18, so that the latter will be screwed off from the threaded neck 15. When the said threaded elements are disengaged, the head 12', tube 16 andparts connected thereto, including the screen 20 and filtering material 21, may be removed from the relatively fixed outer shell 10 and from the head 11 and its neck 15'. The said head 11 is preferably clinched onto the end of the shell 10. I V

. When thesaid parts are removed from the shell, as just noted, the filtering material may be cleaned by dippin in gasoline, without separation of any of t e elements 12, 16, 20 and 21; but if, at any time, it becomes necessary or desirable to remove the filtering material and to supply new material, it is only necessary to remove the nut or bolt 17,

which immediately'disconnects said elements. It is important to note that the annular space bet-ween the perforated or recticulate sleeve 16 and cylindrical screen 20 tapers mlon'gitudinal cross section from the filling toward the opposite end of such space, that is, in a direction away from the head 12. This greatly facilitates the tight and proper packing of the filtering material bet-ween the said elements.

The air cleaner described has been found highly efficient for the purposes had in view and, at the same time, it is of small manufacturing cost. I

The air cleaning device illustrated in Figs. 4 and 5 involves much of the construction illustrated in Figs. 1,2 and 3.v The elements 11, 13, 15, 16, 17, 18, 19 and 20 are, as illustrated, of the identical construction already described, except that they are placed on a verticalrather than, a horizontal axis. In this arrangement, the head 12, which corresponds to the head'12, is telescoped only onto the lower end oft-he cylindrical screen 20; and the cylindrical outer shell 10 which is here set upright, is, at its lower end, connected to the upper end of a funnel-like shell 25; and the said shell 10, at its lower portion, has a plurality. of circumferentially spaced air intake ports 26 formed by pressing the portions 27 inward with inclinations in a common circumferential direction. The funnel 25 is shown as provided below the head 12 with a baffle plate 28 having circumferential air passages 29. On its external surface, the funnel 25 is provided with an annular neck 30 formed with pressed metal threads that engage the pressed metal threads .intake ports 26 will be caused to whirl or take'up a whirling motion within the shell 10 and around the filter. Under this whirling action, the heavier particles, such as dust, will be mostly thrown ,outward and precipitated into the hopper 25 and from thence delivered downward. The forced blast produced by the exhaust, downward through the nozzle 33, will produce a suction in the spout of the funnel 25, which will draw downward the precipitated dust and accelerate its delivery from the hopper 25 and from the shell What I claim is: 1 v

1. An air cleaner comprising an outer casing having a peripheral tangential air intake .and an axial air discharge passage, a tubular filter inserted'into said casin with its interior connected to said discharge passage and and one of which is provided with an air discharge passage, a tubular filter detachably connected to the head having said discharge passage, by means of screw-threaded engagement, and connected. to rotate with the other headof said casing. p

4. An air cleaner comprising an outer casing having airintake means and provided with a head having an air discharge passage and a threaded neck, and a tubular filter comprising spaced perforate tubular members and intervening fibrous filtering material, the

inner tubular member having threaded engagement with said threaded neck, and a 6 The structure defined in claim 4 in head secured to the extended ends of sald which the annular space between said inner perforate tubular members and rotatable and outer, perforate tubular members i 10 therewith. creases in cross section toward the said head,

5 5. The structure defined in claim 4: in by means of which the filter may be rotated.

which said latter noted head also forms a In testimony whereof I afiix my signature. head to close one end of said outer casing. FRANK A. DONALDSON. 

